Cylinder hone



P. C. GROVER CYLINDER HoNE May 5, 1931.

Filed Nov. v4, 1929 mlll 4. W .a/Z

l illllll v lllllrlllll INVENTOR Pere/y 6. fraz/er QMZ? M o nNEYs Patented May 5, 1931 PATENroFI-ICE PERCY C. GROVER, OIE' BIRMINGHAM, ALABAMA Appiiation mea Nvember 4, i929, serial No. 404,612;

invention relates to tools forpolisliingV or grinding the interiorof engine cylinders,

particularly to cylinder hones, and has for its object the provision of atool ofthe character 5 designatedwhich shall be simple of design,

easyof manufacture, and one which maybe readily and quickly adjusted to grind dilerent sizes of cylinders. l

A further object of-'my invention is to pro- 10 vide a cylinder hone embodying a plurality of grinding members in which an even bearing of all the grinding members against the surface of the cylinder is secured and in which the angle of application of the grinding members to the surface ofthe cylinderis such as to prevent chatter. y A still further object of'my invention is to provide a cylinder grinding tool embodying a plurality of grinding members and in which each of the grinding members may be turned to provide a pluralityof grinding surfaces.

1Briefly, my invention comprises a plurality of hones, each being preferably cylindrical in' shape and which vare pivotally mounted on parallel shafts between relatively fixed end plates. Journaled inthe end plates is a central shaftliaving a gearv formed thereonintermediateits ends which meshes with gear members operatively connected to the hones to provide outward movement thereof in unison. At the upper end of the central gear shaft is a ratchet which cooperates with a pawl to hold the hones in any set position. Associated with the pawl is a means for providing micrometer setting of the hones. At

the upper end of the apparatus is a'means forv connecting it to a suitable motor drive.

Apparatus embodying features ofy my invention is illustrated in Lthe accompanying drawings forming a part of this application, in which 'f Fig. 1 is a sectional elevation ofthe apparatus, with parts thereof broken away to show details of construction; 4-5 Fig. 2 is a.. sectional plan view of the apparatus taken on the line vII--II ofFig. 1; Fig. 3 is a sectional-view of the apparatus taken'along the line III-III of Fig. 1 g

gig; 41S, a detail of the pawl mountingg an Y Fig. 5 is a view showing a ni'odied form of cutting element.

' Referring to the drawings for a better understanding of my invention, Vmy improved tool comprises an upper end plate. 10 and a lower end plate 11 joined together by three relatively fixed shafts 12, 13 and 14.

Joined tothe upper side'of the plate 10 is a yoke 16 which terminates in a round threaded portion 17 to which is coupled sleeve 18. .Connected to the sleeve 18 by a universal joint 19 is a coupling 21 adapted for connection to any suitable drive 22.

- Freely journaled in the end plates 10 and 11' is a cent-ral shaft 23 carrying a ratchet 24 at itsupper end and provided with gear teethV 2G intermediate its ends. Mountedhbove the ratchet 24 is a 'ring 27 having a segment thereof cut out to form anopening'28. The ring`27 is secured-tothe yoke 16 by means of screws 29. Beneath the ringr27 is a floating Vring 31 journaled on the yoke'l and havingV a lug 32 thereon which extends upwardly into the segmental opening 28 in the ring 27. Pivotally mounted inthe ring 31 isa pawl 33 adapted to engage with `the ratehet24 of theshaft 23 to hold it against rotation in the directionV indicated by the arrows in Fig.

`2. 'The lug 32Yis provided with a threaded opening through, which extends Aa set lscrew 36 which is adapted to bearV against the cut out portion of ring 27 and provide micrometer adjustment of the positionV of the pawl 33. Normally, the pawl 33 is held inwardly by means-of a small spring 37. V 5

Journaled on each ofv the shafts 12, 13

and 14 arejupper and lower bracket members Y 38 and 39,jeach'having an outwardly extending arm 40. Mounted `between the arms 40 .of the bracket-membersv 38 and 39 is a'honeg 41 which, in the-examples shown 1n Figs. 1

:lower end of each ofthe bolts 42 is a nut 44 which draws the arms of the bracket members tightly against the ends of the hone and prevents itsY turning relative illerete-v Intermediate the ends of each of the hones is a reduced portion, preferably in the form of a metal sleeve, 46. Journaled on each of the shafts 12, 13 and 14, is a segmental gear 47 which meshes with the gear 26 on the shaft 23. Each of the gears 47 is provided with a lateral cut out portion 43 which lits snugly about the sleeve 46 of the hones, as clearly shown in Fig. 3 of the drawing, so that the gears 47 and hones 41 move in unison about the shafts 12, 13 and 14. Inasmu'ch as the bracket members 33 and 39 are free to rotate about the shafts 12, 13 and 14, it will be seen that the hones 41 will move outwardly and inwardly in unison due to the meshing of the gears 26 and 47. In order that the hones may be moved inwardly a considerable amount to accommodate relatively' small cylinders, the plate 11 is provided with slots 51, 52 and 53 to receive the lower ends of the shafts 42 with the nuts 44 which hold the hones in place.

From the foregoing description, the operation of my improved apparatus will be readily understood. Letting the circle 60, in Fig. 2, represent the inner wall of a cylinder to be polished, the tool is let partway down into the cylinder, and the hones 41 are pulled out by hand until they fit loosely within the cylinder, the pawl 33 riding over the teeth of the ratchet 24 during this operation. The adjusting screw 36 is then turned to give the necessary micrometer adjustment of the hones, tightening the screw up causing the hones to move outwardly, while loosening it allows them to move inwardly. The tool is next rotated in the usual manner until the work is done. rIlle hones may be released by pressing against the outer end of the pawl 33 with the finger to release it, whereupon the hones may be moved to their innermost position by hand.

In the grindingoperation, it will be noted by reference to Fig. 2 that the ar as 40 of the bracket members 38 and 39 are at such an angle to the walls of the cylinder that the hones 41 are behind their associated shafts 12, 13 and 14. This feature insures that the hones bear evenly against the sides of the cylinder and that no chatter of the tool occurs. As soon as the hones have become worn out of true, they may be turned on their shafts 42 by loosening the clamping nuts 44 and be turned to provide a new surface for applications to the wall of the cylinder. After all of the surface of the elements has been worn down, they may be trued up and used again in a manner well understood inthe art.

Referring to Fig. 5, I show a modified form of hone 41a which is similar in all respects to the hone 41 shown in Figs. 1 to 3, except that it is octagonal in cross section rather than circular. For some classes of work, it may be more desirable to employ a flat surface rather than a circular surface such as is provided with forms of hones shown in Figs. 1 to 3. When one of the flat surfaces of the octagonal hones 41a has worn outof true, a new surface may be provided by loosening the clamping nuts and turning it as described for the cylindrical grinding hones.

From the foregoing it will be apparent that I have devised an improved polishing tool which is simple and sturdy of design, easy of manipulation, and adjustment and one in which the hone may be readily adjusted to present new grinding surfaces.

While I have shown my invention in but two forms, it will be obvious to those skilled in the art that it is not so limited but is susceptible of various other changes and modifications without departing from the spirit thereof and I desire therefore that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

lVhat I claim is:

1. In a tool of the character described, a pair of end plates, a plurality of shafts joining the end plates, a hone pivotally mounted on each shaft and adapted to swing inwardly and outwardly of the end plates, gear means for effecting movement of the hones in unison, a ratchet means for holding the hones in a set position, and means for adjustably positi oning the ratchet means to vary the position of the hones.

2. In a tool of the character described.I a pair of end plates, a plurality of shafts joining the end plates, a hone pivotally mounted on each shaft and adapted to swing inwardly and outwardly of the end plates, gear means for effecting movement of the hones in unison, a ratchet means for holding the hones in a set position, means for adjustably positioning the ratchet means to vary the position of the hones, and means for adjustably positioning the h ones in their pivotal mounting means.

3. In a cylinder` polishing tool, upper and lower end plates, a plurality of shafts rigidly joining the end plates,upper andlowerbrackets pivotally mounted on each of the shafts, a hone rigidly securedbetween each oftheupper and lower brackets, a central shaft ournaled in the end plates and provided with a gear, a gear journaled on each of the shafts connecting the end plates and'meshing with the gear on the central shaft and operatively connected to its associated hone, a ratchet carried by the upper end of the central shaft, a ring surrounding the ratchet and movable with respect thereto, a pawl pivoted in the ring, and means for adjustably positioning the ring with respect to the upper end plate.

4. In a cylinder hone, the combination of a pair of end plates, a rotatable shaft journaled in the end plates and provided with gear teeth, a plurality of relatively fixed shafts eX- tending parallel to the rotary shaft and joining the end plates, upper and lower bracket members pivoted on each of the fixed shafts, a hone rigidly secured between the bracket members of each xed shaft and adapted to swing about said shaft, gear means associated wit-h each of the hones and meshing withthe gear teeth of the rotary shaft, and ratchet means for holding the hones in a set position.

5. In a cylinder hone, the combination of a pair of end plates, a rotatable shaft j ournaled in the end plates and provided with gear teeth, a plurality of relatively fixed shafts extending parallel to the rotary shaft and joining the end plates, upper and lower bracket members pivoted on each of the fixed shafts, a

hone rigidly secured between the bracket members of each fixed shaft and adapted to swing about said shaft, gear means associated with each of the hones and meshing with the gear teeth of the rotary shaft, ratchet means for holding the hones in set position, a ratchet Wheel on the upper end of the rotatable shaft, and a pawl associated with the upper end plate to cooperate with the ratchet to holdthe hones in a set position.

6. In a cylinder hone, the Vcombination of a pair of end plates, a rotatable shaft journaled in the end plates and provided with gear teeth, a plurality of relatively fixed shafts extending parallel to the rotary shaft and joining i the end plates, upper and lower bracket members pivoted on each of the fixed shafts, a hone rigidly secured between the bracket members of each fixed shaft and adapted to swing about said shaft, gear means associated with each of the hones and meshing with the gear teeth of the rotary shaft, ratchet means for holding the hones in a set position, a ratchet wheel on the upper end of the rotatable shaft, a pawl as-` sociated with the upper end plate to cooperate with the ratchet to hold the hones in a set po- Y Y sition, and means for adjusting the position of the pawl with respect to the end plate.

7. In a tool of the character described, a pair of end plates, a plurality of cylindrical hone members adjustably mounted between the end plates for inward and outward movement to grinding position, and adjustable means for clamping the hone membersagainst rotary motion about their respective axes.

In testimony whereof I affix my signature.

PERCY C. GROVER. 

